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is a significant concern for physicians. Central- P9 D$ [+ H U% c7 X
precocious puberty (CPP), which is mediated0 b1 g9 ~; y9 n9 {7 H3 C* [6 A
through the hypothalamic pituitary gonadal axis, has$ f( P( J& f; u9 i' t
a higher incidence of organic central nervous system4 b' g. V" O$ i0 i. |2 @0 T [
lesions in boys.1,2 Virilization in boys, as manifested" q; x' i& w: v1 T* \
by enlargement of the penis, development of pubic0 M) ] j8 u' H; b2 S
hair, and facial acne without enlargement of testi-+ ]2 l3 a& F) `6 q2 V7 k3 ?7 f3 V A- ^
cles, suggests peripheral or pseudopuberty.1-3 We8 t8 {3 d3 Y! K% ~! I, `( w
report a 16-month-old boy who presented with the+ U9 Z1 J! ]# T' i3 N1 \: s
enlargement of the phallus and pubic hair develop-3 o% G1 ]1 p0 J4 D; f& X9 n
ment without testicular enlargement, which was due) F8 a* p7 N u4 H
to the unintentional exposure to androgen gel used by! {8 y* j* ?5 a* W
the father. The family initially concealed this infor-
. {' {( _0 E/ _, [ L1 Nmation, resulting in an extensive work-up for this
) _( N" m8 x+ Dchild. Given the widespread and easy availability of
# H+ n% t: x3 s9 ctestosterone gel and cream, we believe this is proba-1 e5 s8 W; _8 d: N8 H! Z6 b7 R
bly more common than the rare case report in the" O0 r9 m3 B! m3 V$ o5 O
literature.4
: u6 L2 U$ \3 r( F$ ~Patient Report
+ `5 `& m8 ~& V) y! N6 ]2 kA 16-month-old white child was referred to the, p3 h7 h' \0 K/ e) Z: U
endocrine clinic by his pediatrician with the concern( B3 z- U6 L1 l
of early sexual development. His mother noticed
, [7 b& r# L1 `% l w! tlight colored pubic hair development when he was
; ?; s$ Z2 u" X2 o. VFrom the 1Division of Pediatric Endocrinology, 2University of8 V# K7 c0 A' k+ \
South Alabama Medical Center, Mobile, Alabama.- ?& x. p3 H) i' }8 x
Address correspondence to: Samar K. Bhowmick, MD, FACE,
! f$ j8 E8 f9 Z; [Professor of Pediatrics, University of South Alabama, College of) [( N% M7 Z" S1 O3 ^% y- k
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;) Y) b. o# u4 t8 y! ]
e-mail: [email protected]./ @: E4 r( T# @; i& f
about 6 to 7 months old, which progressively became
; p# z/ k2 o6 ldarker. She was also concerned about the enlarge-7 Z2 A' ` x7 v! G/ k% |8 h* ^
ment of his penis and frequent erections. The child
/ h4 o2 Q. B% I5 Y x w" awas the product of a full-term normal delivery, with Y7 m0 g# d! z
a birth weight of 7 lb 14 oz, and birth length of+ s6 z. R1 j3 g5 ~0 U
20 inches. He was breast-fed throughout the first year, i0 Y0 X2 i9 i5 j2 I% Z$ ~! v
of life and was still receiving breast milk along with
* V7 z7 r3 ~0 W: U1 Csolid food. He had no hospitalizations or surgery,3 {1 ~4 S& W4 R/ m7 C u# P
and his psychosocial and psychomotor development
" I5 F( p7 u$ ^1 _# E ]$ t6 awas age appropriate.; B+ _- X' A* R, [
The family history was remarkable for the father,
7 u; H v3 K# n: [% g. \+ ?who was diagnosed with hypothyroidism at age 16,
5 k6 q: ?: J1 [ g) K8 r0 Kwhich was treated with thyroxine. The father’s" ?( X4 { B2 P2 S$ z
height was 6 feet, and he went through a somewhat5 M9 s; R: K9 m. H F
early puberty and had stopped growing by age 14.' h0 I, [. @) j) K
The father denied taking any other medication. The
: J) q$ w6 c5 X7 {% ichild’s mother was in good health. Her menarche
- S. u, c+ X! a& E2 \9 X6 gwas at 11 years of age, and her height was at 5 feet; P/ s$ @& s5 w% e7 O) m
5 inches. There was no other family history of pre-" ?$ R) _& R! ^
cocious sexual development in the first-degree rela-4 c1 I& |0 O% G" }# ]
tives. There were no siblings.
, q+ h; R0 e: ], F/ sPhysical Examination
' W: b2 x* K' v4 wThe physical examination revealed a very active,
( H0 M* D# M2 ?6 _6 [9 e6 jplayful, and healthy boy. The vital signs documented
# ~+ Q. b f+ `1 ja blood pressure of 85/50 mm Hg, his length was' P# f- m8 n. t0 S1 u; H
90 cm (>97th percentile), and his weight was 14.4 kg/ R2 }: [! s0 k+ W
(also >97th percentile). The observed yearly growth+ n7 y1 }8 U4 V. R
velocity was 30 cm (12 inches). The examination of
~8 R4 N* ?- h2 P8 C* uthe neck revealed no thyroid enlargement.
$ \$ X6 f. h/ N G' VThe genitourinary examination was remarkable for" [! B m- O1 n, W ?8 c
enlargement of the penis, with a stretched length of
7 _& F6 |# I# \0 p8 L8 cm and a width of 2 cm. The glans penis was very well
# C( ^, D' k. T) f( h( ideveloped. The pubic hair was Tanner II, mostly around
6 H v# N3 ?6 q% A8 B9 X540: O& u. ]+ `+ C/ i! B1 B! H
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from* o0 |& d% V. v# _
the base of the phallus and was dark and curled. The
$ u; d* W+ ]* P: _testicular volume was prepubertal at 2 mL each.
3 B! P$ r3 E7 d9 q0 H" `0 bThe skin was moist and smooth and somewhat
. Y& a! @3 s2 _: R6 i' t; Z4 Yoily. No axillary hair was noted. There were no( ?# y5 C8 I/ L2 G1 d2 Q, b1 k
abnormal skin pigmentations or café-au-lait spots.( s r3 l+ E1 U( Y2 e _1 a! `8 M
Neurologic evaluation showed deep tendon reflex 2+; C2 V( O9 L7 g l) p6 N4 T) q
bilateral and symmetrical. There was no suggestion6 p+ b: E1 G8 \$ k: ^
of papilledema.3 K) e4 o$ n3 @; a; M- i
Laboratory Evaluation8 c2 e2 E6 u0 f) l) Q
The bone age was consistent with 28 months by' o5 _" w' O* }, s$ v
using the standard of Greulich and Pyle at a chrono-) G" v9 Y2 \1 B6 h1 L$ Y1 c; Z/ C- p
logic age of 16 months (advanced).5 Chromosomal! ~$ |* t* m5 I, K# O+ B
karyotype was 46XY. The thyroid function test
+ F9 U) A: i7 }! j% ushowed a free T4 of 1.69 ng/dL, and thyroid stimu-& ]" g* U4 }- ]$ b& ~" A
lating hormone level was 1.3 µIU/mL (both normal).
6 _, Z* ?$ ]+ ]2 ~) oThe concentrations of serum electrolytes, blood! z1 e+ Y+ T( {' j7 b4 ]8 [9 \7 j& d
urea nitrogen, creatinine, and calcium all were
5 `. O) @2 M3 m" r# |- x Xwithin normal range for his age. The concentration
- {+ g6 [' S6 e) P- @of serum 17-hydroxyprogesterone was 16 ng/dL- u4 R8 b- F1 H% I% m
(normal, 3 to 90 ng/dL), androstenedione was 20
" ]# o1 O" n* B0 B4 E: j: Jng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
# P3 j# o# ^+ [- k' P9 i; jterone was 38 ng/dL (normal, 50 to 760 ng/dL),
, _$ v3 z _, G% H5 O) K7 ndesoxycorticosterone was 4.3 ng/dL (normal, 7 to- ~) D% d6 m! y; ?# c
49ng/dL), 11-desoxycortisol (specific compound S)
4 x1 _* i( b; c Y7 uwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
; `# u' N% I, l- ^7 i7 W2 w( t: ytisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
8 `* I. v0 V( u7 I9 X9 Mtestosterone was 60 ng/dL (normal <3 to 10 ng/dL),
8 U+ v: N& s3 y9 n" a( ]# v; nand β-human chorionic gonadotropin was less than
* @2 ?3 X) m- f* I1 S5 mIU/mL (normal <5 mIU/mL). Serum follicular8 `( ~& h" g, j7 E* C, o. f
stimulating hormone and leuteinizing hormone! W8 C8 F4 U* j( j+ a
concentrations were less than 0.05 mIU/mL* w4 ` s) v9 j9 M' D
(prepubertal).) ?9 T: W8 S5 ]7 Z
The parents were notified about the laboratory) C" k. K& Y$ q! |& i( Q/ V. L
results and were informed that all of the tests were% k. _+ z7 Z& z; d
normal except the testosterone level was high. The
8 A$ D0 w; J, g I+ \4 [follow-up visit was arranged within a few weeks to
' N1 r" x3 G" Lobtain testicular and abdominal sonograms; how-# M+ v/ a5 P3 U
ever, the family did not return for 4 months.( \# x, Q, |8 q) U D; m
Physical examination at this time revealed that the
, z# ?* t( j$ z4 Z, j$ U* R/ K. d$ Achild had grown 2.5 cm in 4 months and had gained$ c' f# ]. H5 U6 p8 L ]+ ~4 {! X
2 kg of weight. Physical examination remained
0 q# K+ [5 B) Wunchanged. Surprisingly, the pubic hair almost com-( v9 y [3 g7 s. n {
pletely disappeared except for a few vellous hairs at
' C: w3 S) j! F: n j; ?& Wthe base of the phallus. Testicular volume was still 21 F* @% |6 [$ S
mL, and the size of the penis remained unchanged.
$ t# }: G4 q! {# hThe mother also said that the boy was no longer hav-) U( r- `- U+ M6 a, D
ing frequent erections.
$ ~1 ^) E9 I1 q- ?1 F0 y3 L z7 c4 v0 LBoth parents were again questioned about use of
* B7 d; ^) ^% l1 `9 c9 x$ V) r. V, Y+ M, Rany ointment/creams that they may have applied to9 d, {. ~+ ?2 _. H- X5 Q6 B- T$ U
the child’s skin. This time the father admitted the& M% J+ g! ^7 e9 v& L. L/ o7 c
Topical Testosterone Exposure / Bhowmick et al 541/ q% ^7 T3 E( Y( K [- _
use of testosterone gel twice daily that he was apply-
8 {8 w* F. c+ Hing over his own shoulders, chest, and back area for
/ |: a2 }0 B6 P9 ~! a+ e6 _9 ba year. The father also revealed he was embarrassed5 w" d0 a5 B9 |3 |& Z& f; P4 W+ k
to disclose that he was using a testosterone gel pre-5 L% B4 Y+ i5 k& s
scribed by his family physician for decreased libido" [; x& P% _: r' d/ ^$ d& a0 y
secondary to depression.: i2 P; _0 j/ D3 P1 j" D
The child slept in the same bed with parents.
% H! \* L0 i1 }" E. _* C) Y7 c4 TThe father would hug the baby and hold him on his
: @; c0 Z& u# d% |chest for a considerable period of time, causing sig-
0 O# `8 o) L) Znificant bare skin contact between baby and father.
! M" M0 h, _6 R) N) N& E2 GThe father also admitted that after the phone call,. y" |1 R* W; E/ M# l9 @% w
when he learned the testosterone level in the baby
$ W* ^ ~ L9 Z2 `7 o/ Jwas high, he then read the product information
* p; h# P! Z; T- gpacket and concluded that it was most likely the rea-. n0 \9 c+ A u$ O
son for the child’s virilization. At that time, they
+ B. T, P, G8 X" [ zdecided to put the baby in a separate bed, and the1 c4 b4 ?, y' A* ~+ g
father was not hugging him with bare skin and had5 T2 g8 q( d7 h
been using protective clothing. A repeat testosterone
9 E$ N) W1 K' q* C3 h5 |8 i$ Qtest was ordered, but the family did not go to the9 k9 p) m! _2 X- F( F4 M7 R. S
laboratory to obtain the test.! A9 X2 S' ]/ J3 k5 v( l
Discussion
" Z6 }! j2 \. ~! {Precocious puberty in boys is defined as secondary
$ B: V+ _4 M2 ~. D# e$ W: hsexual development before 9 years of age.1,46 B3 `3 _- Y, {
Precocious puberty is termed as central (true) when5 D0 j0 y8 G, m- [; K) L$ ~. }
it is caused by the premature activation of hypo-# R9 ]3 N k! c* \# F( A
thalamic pituitary gonadal axis. CPP is more com-
) W( q+ ?. V2 }mon in girls than in boys.1,3 Most boys with CPP4 G- i4 t# ~0 e( D; R. q* r
may have a central nervous system lesion that is
9 E" b/ n! E) v& tresponsible for the early activation of the hypothal-
$ g+ r7 Q1 Z0 ~0 p& H6 C( qamic pituitary gonadal axis.1-3 Thus, greater empha-( D5 i, [5 f9 v9 c: d5 k# ?7 R
sis has been given to neuroradiologic imaging in
1 r4 ~- `+ S6 ]0 kboys with precocious puberty. In addition to viril-9 e4 g( l, j# \6 W: m& N' Q
ization, the clinical hallmark of CPP is the symmet-
" U t( Y8 d+ Frical testicular growth secondary to stimulation by
% M# y1 V6 q- A- Jgonadotropins.1,3
, \- j6 f1 ^' V9 H4 B! zGonadotropin-independent peripheral preco-
( u6 V6 \6 m' {* A6 `cious puberty in boys also results from inappropriate& t1 o w0 u2 [
androgenic stimulation from either endogenous or
: J& E- m$ w0 d5 }0 l5 ^exogenous sources, nonpituitary gonadotropin stim-. e2 z# ^$ \+ I3 }
ulation, and rare activating mutations.3 Virilizing
. V6 s. P8 ~! {* [congenital adrenal hyperplasia producing excessive
8 [4 M5 N8 t5 K6 Vadrenal androgens is a common cause of precocious
2 Z6 ?$ b( P+ p* T* \# Y, ?; }1 kpuberty in boys.3,4
& p( C2 r: R, F6 `( _The most common form of congenital adrenal) B2 K; C' u& b# N2 {, x6 z
hyperplasia is the 21-hydroxylase enzyme deficiency.+ O3 \+ j n8 r0 Z- a6 y
The 11-β hydroxylase deficiency may also result in
- \9 b3 I1 u1 g6 k/ jexcessive adrenal androgen production, and rarely,
6 u% S- H: j& man adrenal tumor may also cause adrenal androgen
2 x) D/ k6 n* P1 q( Iexcess.1,3
0 j p$ ?, n+ c/ @2 x$ fat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from. y" ~% k* l+ g' C
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007- u7 {. S* I! w8 u" |% G0 e
A unique entity of male-limited gonadotropin-7 c4 v# G/ Y$ \
independent precocious puberty, which is also known
/ ]9 Y( I& g. u) Bas testotoxicosis, may cause precocious puberty at a
6 ~% ]- @5 ^+ Qvery young age. The physical findings in these boys3 [7 X- h% s4 U% Y( K
with this disorder are full pubertal development,
1 o- P5 |3 _2 P) K/ l$ A( wincluding bilateral testicular growth, similar to boys
0 ?% k! X7 F5 Owith CPP. The gonadotropin levels in this disorder
& a2 l2 O: a: Lare suppressed to prepubertal levels and do not show
! c: x' _5 U1 W/ b6 n& `+ `" }pubertal response of gonadotropin after gonadotropin-
7 M! z8 u* y \5 M. ]6 k, Greleasing hormone stimulation. This is a sex-linked
1 S5 Y9 [% v* g0 f( F2 \7 W/ i% vautosomal dominant disorder that affects only0 V# z0 X! F7 X( a( l7 E5 _
males; therefore, other male members of the family
0 {2 t" L, x* |& U5 Pmay have similar precocious puberty.3, b" ~! h4 Q4 E$ H: R/ `+ M
In our patient, physical examination was incon-
9 `- k% V- _/ s$ X: nsistent with true precocious puberty since his testi-
& l, V; h6 V( _7 O( M7 gcles were prepubertal in size. However, testotoxicosis
0 u9 h( o. h) G: D$ hwas in the differential diagnosis because his father8 A( l5 Q/ j4 |% k1 p' P) l
started puberty somewhat early, and occasionally,
0 Q- z' J# U% y' N0 j' a; mtesticular enlargement is not that evident in the$ M0 R) v6 }% c4 p/ v+ b1 g
beginning of this process.1 In the absence of a neg-: o- T5 D2 K: K& `+ ^" U* X
ative initial history of androgen exposure, our
) q9 _6 @& h5 \% k# z- Xbiggest concern was virilizing adrenal hyperplasia,1 ?# T% m) C9 P3 |& o- H4 n" k
either 21-hydroxylase deficiency or 11-β hydroxylase
2 Q" _/ c5 x& p/ Fdeficiency. Those diagnoses were excluded by find-
7 I3 O4 K) O$ p1 Z, @ing the normal level of adrenal steroids.( `- n, f& b' G" M& u* ~
The diagnosis of exogenous androgens was strongly
0 a& P( b4 C6 [5 @+ Csuspected in a follow-up visit after 4 months because
+ x# L4 _4 l% `+ w8 c7 e& p; bthe physical examination revealed the complete disap-
* B% u# P/ F G9 q( s" |5 Cpearance of pubic hair, normal growth velocity, and
* q2 m# H1 P7 o. m; \. b) Ddecreased erections. The father admitted using a testos-' X# y. D; v7 T+ ^4 p3 H
terone gel, which he concealed at first visit. He was
3 D& X7 q& `/ c0 susing it rather frequently, twice a day. The Physicians’
6 _, @* [: h+ ^Desk Reference, or package insert of this product, gel or
d8 L6 [, Z( R" O2 g3 Q& v+ Pcream, cautions about dermal testosterone transfer to
* a4 G N7 t& V* N! |( runprotected females through direct skin exposure.
" @9 j9 \' R) j2 _5 W! jSerum testosterone level was found to be 2 times the
" t `" b0 L ` W8 m- B wbaseline value in those females who were exposed to: i+ L* l _! M" O1 Q% E
even 15 minutes of direct skin contact with their male: w2 ]' S7 a7 I' M0 @
partners.6 However, when a shirt covered the applica-
$ X1 l: k1 {: R0 \! jtion site, this testosterone transfer was prevented.
. Q: S+ ^ ]! WOur patient’s testosterone level was 60 ng/mL,
2 y) r' B2 G* N O8 O. \8 Mwhich was clearly high. Some studies suggest that
7 }* Y" N# n+ @0 Y5 M3 {dermal conversion of testosterone to dihydrotestos-
4 K. B4 `1 B5 e* a( H# Pterone, which is a more potent metabolite, is more
b3 V7 L, E( C( [. zactive in young children exposed to testosterone
: _5 F% q( K' A9 b9 l$ cexogenously7; however, we did not measure a dihy-
V6 U! ~: P4 i! m% K, zdrotestosterone level in our patient. In addition to" ^1 H6 Q( B! Y, M* Q E! o/ @
virilization, exposure to exogenous testosterone in
# z$ A7 J6 R. u- V( J1 Ochildren results in an increase in growth velocity and1 |7 q" l& {0 ~& |0 ^
advanced bone age, as seen in our patient.
9 I* q- A7 S: {7 V' j7 x" \The long-term effect of androgen exposure during
/ V Y4 c2 |* [1 Learly childhood on pubertal development and final( R& V' D" z: k0 k v" g+ w' ^" L
adult height are not fully known and always remain: @# M, z1 J/ B! ?+ v# k3 E9 f
a concern. Children treated with short-term testos-* N/ Q# d/ P- E9 k; _! y. X: Z8 q
terone injection or topical androgen may exhibit some, f# i( W b1 p, ?1 R
acceleration of the skeletal maturation; however, after
2 s% A3 _" h7 y! Q7 rcessation of treatment, the rate of bone maturation
, I1 Z$ l1 X {decelerates and gradually returns to normal.8,9
' Z/ |1 `0 N( I# y/ VThere are conflicting reports and controversy3 O( T2 L* d# o8 k# x
over the effect of early androgen exposure on adult
) X8 W `+ D% J2 g5 ipenile length.10,11 Some reports suggest subnormal
( m. q' D0 Y3 A( X1 |# {adult penile length, apparently because of downreg-8 h c( L7 y* B! g; ?4 n) w5 J/ b3 |
ulation of androgen receptor number.10,12 However,
5 ?& P! w- v7 ?4 `Sutherland et al13 did not find a correlation between
; P4 x, b5 {. o% R- ?childhood testosterone exposure and reduced adult
* L0 Z8 _: G0 v3 l: i% k5 Spenile length in clinical studies.% F$ O! x) {1 Y. P1 Q3 f
Nonetheless, we do not believe our patient is, H* y. a- u8 }! [( R' j: p
going to experience any of the untoward effects from1 t; [+ j4 {) ~5 a9 f2 i
testosterone exposure as mentioned earlier because
6 e8 B5 @/ y4 z% `the exposure was not for a prolonged period of time.
% ^0 b# \$ i: oAlthough the bone age was advanced at the time of* J2 _4 [, V' T
diagnosis, the child had a normal growth velocity at6 P0 `9 l: N" g$ o
the follow-up visit. It is hoped that his final adult
8 W R: o+ h# V7 V& fheight will not be affected.
5 O+ U+ n4 K" l0 j& fAlthough rarely reported, the widespread avail- T3 L' V# ^3 G* d" k' X8 i0 n' U0 H* _
ability of androgen products in our society may
' }6 a4 W) T; k2 M+ }+ z/ s tindeed cause more virilization in male or female$ B$ C$ ]! ?) E
children than one would realize. Exposure to andro-' c4 ]' _: V2 l2 k
gen products must be considered and specific ques-
( [/ {( ^. Q" k1 x/ L( vtioning about the use of a testosterone product or
0 K6 t* ^% A8 h! d+ o$ |gel should be asked of the family members during4 _& |) ^+ x! s# `" s7 V
the evaluation of any children who present with vir-, Q' c* {8 k5 t, |
ilization or peripheral precocious puberty. The diag-4 e( P' s$ J! K) Z- w# y8 {
nosis can be established by just a few tests and by
6 I$ ]* F1 |$ Gappropriate history. The inability to obtain such a( ?4 u) Y" Z' J& `; P' ^
history, or failure to ask the specific questions, may6 Y7 c+ [! Y/ w! W: p+ a
result in extensive, unnecessary, and expensive; |2 K! V4 Q- y3 E4 M3 N+ S* d2 s7 o
investigation. The primary care physician should be
4 I6 G( @- v y' f1 xaware of this fact, because most of these children
2 L# _+ ` R Smay initially present in their practice. The Physicians’
) K! R6 q: O: K% r* R. O( ADesk Reference and package insert should also put a$ y) T. c; R0 X- Z9 x5 T5 w; T2 q3 X
warning about the virilizing effect on a male or
" ]; q/ l6 L6 cfemale child who might come in contact with some-
1 Y0 L4 @: i; Ione using any of these products. O9 M( f+ E: O0 f ? ?& u5 b
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' L6 }- Z' u# }7. Klugo RC, Cerny JC. Response of micropenis to topical
' J" \: m& Y" ?' O/ b9 n/ Etestosterone and gonadotropin. J Urol. 1978;119:( B/ r- P/ T6 E; A, |0 u" ~
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